I do neon in Los Angeles, but don't ship for obvious reasons. Cost of just the glass can run $45 per letter, plus the pattern ($250 sometimes) and the cost of transformer ($150) approx. Also, glass housings, they're about $25 each and you need two per unit.
I suggest you look for local neon shops wherever you are. It's getting harder and harder to find benders, the old guys are retiring, and few younger guys who want to learn.